Electric motor



(No Model.) 2 Sheets-Sheet 1.

G. O. PEGK.

ELECTRIC MOTOR.

No. 411,833. 8 Patented 001:. 1,1889.

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N. PCTEIS. MIN W. WW D. C.

(No Model.)

2 SheetsSheet 2. G. O. PEGK.

ELECTRIC MOTOR.

Patented Oct. 1, 1889.

UNITED STATES PATENT OFFICE.

CHARLES C. PECK, OF MIDDLEEURY, VERMONT, ASSIGNOR TO THE GIANT ELECTRIC MOTOR COMPANY, OF KITTERY, MAINE.

ELECTRIC MOTO R.

SPECIFICATION forming part of Letters Patent No. 411,833, dated October 1, 1889.

Application filed September 25, 1888. Serial No. 286,319. (No model.)

To all whom it 12mg concern.- to its own magnetic axis, and having its sur- Be it known that 1, CHARLES C. PECK, of face adjacent to the fixed electro-magnets Middlebury, county of Addison, State of Vermade eccentric to the axis of revolution, but mont, have invented an Improvement in more nearly concentric with its own magnetic Electric Motors, of which the following demass, one series of magnets being wound, scription, in connection wit-l1 the accompanysubstantially as described, to produce revering drawings, is a specification, like letters sals of polarity in each of its magnets, as

on the drawings representing like parts. each magnet of the other series is revolved This invention relates to electric motors, by each magnet of the first series of magnets, to and has for its object to provide a novel and substantially as will be described.

eflicient motor of increased capacity and Other features of my invention will be power, my improved motor being especially pointed out in the claims at the end of this adapted to be used on railway-cars or in specification.

other places where heavy work is to be done. Figure 1 is an end elevation of a motor 15 Electric motors as now commonly conembodying my invention, looking tothe right structed and known to me, when used for in Fig. 2, the outer bearing for the shaft and heavy work requiring a slow motion snch, the commutator attached thereto being refor instance, on cars employed on electric moved. Fig. 2 is, a longitudinal section of street-railways--are not mounted directly the motor shown in Fig. 1 on line 5c 00. Fig.

20 upon the car axle or shaft to be driven; but 3 is a cross-section of the motor shown in Fig. the shaft of the said motor is coupled or con- 2 on line y y to more clearly show the connected with the said axle or shaft to be driven strnction of the cores, the coils of wire beby intermediate gearing to obtain the desired ing shown on but two cores; Fig. 4, a detail or necessary leverage or power. to more clearly show the commutator and re- 2 5 My invention has for its object to construct versing switch or mechanism by which the dian electric motor, as will be described, whererection of rotation of the motor shaft is by the torsional effort of the motor on its changed; Fi 5, a sectional detail 011 line :11 shaft is increased to such extent that the at, Fig. 4; and Fig. 6 is a diagram showing said motor may be applied directly to the the manner of connecting the Wires of the 0 shaft to be driven-that is, the motor-shaft armature and field magnets and the course forms a part of the shaft to be driven, the and distribution of the electric current. said motor being capable of being constructed The frames or supports A A are provided,

to revolve at any desired speed. as shown, with hubs A which form bearings In accordance with my invention the infor the shaft A of the motor. 35 creased torsional effort of the motor is ob- TheframesAA' have secured to their outer tained by having both the field and armature ends, as by bolts a, magnetic cores a, sepacomposed or made up of a number of inderated from the frames A A by check-pieces pendent magnets, the outer periphery of aipreferablyof brass. The cores a, as shown each armature-magnet being made eccentric in Fig. 2, are reduced or cut away at the cen- 0 to the inner periphery of the field-magnets, ter to form a shank, as a about which the whereby a uniform movement of approach wire a is wound, as shown in Fi 3, the ends of the surface of one magnet toward the surof each core forming pole-picces, as a. a (see face of the other is obtained to gain or effect Fig. 2,) which, when the cores are placed in a uniform or steady force tending to revolve position and secured to the frames AA, form 45 the shaft and thereby obtain the maximum two parallel circulally-peripheral surfaces eX- power. tending around the motor and having the mo- My invention in an electric machine or motor-shaft A as a common center. The shaft tor consists, essentially, in a series of fixed A, within the frames A A, has keyed or othelectro-magnets and a second series of elecerwise secured on it two disks b 1), preferably 50 tro-magnets movable about an axis parallel of brass. The disks Z) Z), at or near their pe- IOO surface of the pole-pieces of the magnets a and the shaft A.

The hub A on the inner side of the frame A, has loosely mounted on it, as herein shown, a disk I), of fiber or other insulating material, having a commutator composed of a series of segments 1), (see Fig. 4,) preferably of brass, the said segments being arranged in a circle and separated by plates or disks 1), of mica or other suitable insulation, interposed between adjacent segments, the said segments being herein shown secured to the disk I) by screws 1) The segments 0 of the commutator are equal in number to the number of the field-magnets a. The segments b are provided upon their inner faces,

- as herein shown, with a semicircular groove,

pin to keep it in engagement with the commutator-segment, the said socket, preferably made of metal, being herein shown insulated from the disk I) by a cushion c of insulating material. The semi-spherically-shaped groove imparts to the contact-pins a slight movement on their own axes and causes the surface to be Worn evenly. Each segment of the commutator is provided with a screw 0 by which one end of the wire 0 (represented in Fig. 6) is connected to the wire ofo'f the magnets ct. The disk I) has secured to it on its outer face, as herein shown, a disk 0 of insulating material, to which are secured two metallic rings 0 0", having co-operatin g with them contact-pins 0 0 located in sockets e c, insulated, as herein shown, by a cushion e from the frame A, the said contact-pins being kept in engagement with the said rings by spiral springs c. The sockets 0 constitute, respectively, the two terminals of the motor to which the positive and the negative wires are connected, the positive wire being connected, as herein shown, to the socket c and the negative to the socket c.

The field-m agnets a an d the arm ature-magnets 6 are wound alike, but are connected differently, as will be described. Beginning at the inner end the wire of each magnet is laid or wound on its core in a left-hand direction as viewed in the diagram Fig. 6, the ends of the wires of the-different magnets being connected, so that in the field-magnets the outside end of the first magnet is connected to the inside end of the second field-magnet, and the outside end of the second field-magnet to the inside end of the third field-magnet, and so on until the connections have been completed to form a continuous Wire around the field-magnet, as shown in Fig. 6.

The wires of the armature-magnets are connected as follows: The outside end of the wire of the first magnet is connected to the outside end of the wire of the second magnet, and the inside end of the wire of the second magnet with the inside end of the wire of the third magnet, and the outside end of the wire of the third magnet with the outside end of the wire of the fourth magnet, and so on. until the last magnet is reached, when the outside end of the wire of the last magnet is ,connected to the outside ring 6 Referring to Fig. 6, it will be noticed that the ring 0 is connected by wire 20 (see Figs. 2 and 6) to the last magnet, and the first magnet is connected, as by wire 21, to the socket of the latter magnets is changed once for each magnet of the armature during every revolution of the said armature.

As shown inFig. 6, the north poles of the armature are opposite a north pole of the field-magnet and next to a south pole of the field-magnet.

Let it be supposed that the armature is revolving in the direction of arrow 40, and as each north pole approaches a south pole it is attracted by the latter and repelled by the north pole of the field-magnet which it is just leaving, and the south pole of the armature, which is now opposite a south pole of the field-magnet, will be repelled by the south pole of the fieldunagnet and attracted by the next succeeding north pole of the field-magnet. The lines of force emanating from the field-magnets are strongest at the center of the pole-pieces of the said magnets and exert their greatest attractive force upon that portion of the pole-pieces of the armature-cores directly under the pole-picces of the fieldmagncts. Owing to the eccentricity of the outer periphery of the armature-core polepieces, the lines of force reaching from the pole-pieces of the field-magnets gradually increase in length from the center of the polepiece of the armature toward the ends or sides of the said armature pole-pieces. The

lines of force which reach from the center'of the pole-pieces of the field-magnets to the ends or sides of the pole-pieces of the armature-cores have a less attractive force than those reaching directly to the center of the pole-pieces of the armature-cores; but as the armature is revolved the long lines of force gradually grow shorter as the eccentric sides or ends of the armature pole-pieces approach the center of the pole-pieces of the field-magsional effort tending to revolve the shaft is" slower and steadier, thereby obtaining the maximum power of the magnet.

The course of the current may be traced through the motor as follows: The current is led by the contact-pin to the outside ring 0 thence by wire 20 to the armature-coils, the whole current passing through each succeedin g coil of the armature in turn until it reaches the last armature-coil, from whence it passes by wire 21 to one of the contact-pins 0. (See Figs. 2 and 6.) The current is now divided equally between five of the contact-pins c, as indicated by arrows 25, Fig. 6, and from each contact-pin c two-tenths of the whole current passes by the commutator-segment in contact with the pin 0 and wire 0, connected with the said commutator-segment, to the field-magnets, where it is divided, as clearly shown in Fig. 6, and one-tenth of the outer current, as herein shown, passes through each coil of the field-magnets, it returning again by wires 0 to the commutator-segments in contact with the pins 0, the current then passing by wire 2i to the inner ring 0", from whence it is taken by the pin 0 connected to the negative wire of the supply-circuit. The disk U is provided with a slot through which is extended a stud-screw (Z, (see Fig. 4,) the said disk being provided with a handle (1'. (See Figs. 2 and 5.) The slot (1 is made of suflicient length to permit the disk to be turned suliiciently to bring the commutatorsegments in contact with different contactpins-that is, the comnmtator-segments now in contact with the pins 0 will be brought in contact with the pins 0, so that when the current is turned on and passes, as above described, through the armaiure the polarity of the field-magnets will be changed or reversed from what is shown in Fig. 6.

It is evident that the size of the machines may be varied at will, the ratio between the contact-pins, the armature-magnets, and the field-magnets being preserved.

In practice each field-magnet, in. order that it may be charged to the same magnetic potential as each armature-magnet, will be provided, as herein shown, with ten times as many convolutions of wire as the armature-m agnets, which wire would be of much. smaller diameter than the wire employed on the armature-magnets.

It will be noticed that the axis or center of the magnetic .mass or core of each armaturemagnet is parallel with the axis of revolution and with the inner peripheral surface of the. field-magnets; but the surface of the armature-core or magnetic mass is eccentric to the axis of revolution and the said peripheral surface.

Ihave herein shown the inner circle of magnets (designated by me as the armature) as revolving, and the outer circle as stationary; but in some cases it may be desired to have the outer circle of magnets revolve and the inner circle stationary, in which case the shaft will be rigidly supported.

The motor above described may be constructed to run at any desired speed by changing the size of the magnets and the diameter of the circle in which they are placedas,i:or instance, if a high speedis desired. large mag nets placed in a smaller circle are employed, and for low speed. small magnets in a large circle.

I clai1n- 1. In an electric machine or motor, a series of fixed electrormagnets and a second series of electro-m agnets movable about an axis parallel to its own magnetic axis, and having its surface adjacent to the fixed electro magnet made eccentric to the axis of revolution but more nearly concentric with its own magnetic mass, one series of magnets being wound, substantially as described, to produce reversals of polarity in each of its magnets as each magnet of the other series is revolved by each magnet of the first series of magnets, substantially as described.

2. In an electric machine or motor, a series of magnets having two sets of pole-pieces form ing peripheral surfaces concentric with the axis of revolution, and a second set of magnets arranged to revolve on the axis of revolution, and having the surfaces of its pole-pieces adjacent to the first set of magnets eccentric to the said peripheral surfaces, combined with a commutator consisting of contact-pieces I), connected to said magnets and provided with a groove, and pins, as c 0, having sphericallyshaped ends fitted into said groove, and means, substantially as described, to maintain said pins in electrical connection. with the said contact picces, substantially as set forth.

3. In an electric motor, the combination, with the frame A, the shaft A disks 1) Z), mounted thereon, and magnets (0, attached to said frame, of magnets I)", having the outer periphery of their pole-pieces eccentric to the inner periphery of the poles of the magnets a, and supports A A for the magnets 19*, substantially as described.

4:. In an electric machine or motor, a series of magnets having two sets of pole-pieces forming peripheral surfaces concentric with the axis of revolution, combined with a sec ICC) 0nd set of magnets arranged within the first set of magnets to revolve on the axis of revolution, and having the surfaces of its polepieces adjacent to the outer set of magnets eccentric to the said peripheral surfaces, the outer set of magnets being Wound, substantially as described, to produce reversals of polarity in each of the said outer magnets as each inner magnet is revolved by each of the said outer magnets, substantially as described.

5. In an electric machine or motor,a series of magnets having two sets of pole-pieces forming peripheral surfaces concentric with the axis of revolution, a second set of magnets arranged within the first set of magnets to revolve on the axis of revolution, and having the surfaces of its pole-pieces adjacent to the outer set of magnets eccentric to the said peripheral surfaces, the outer set of magnets being wound, substantially as described, to produce reversals of polarity in each of the said outer magnets as each inner magnet is revolved by each of the said outer magnets,.

combined with the commutator consisting of contact-pieces Z7 and pins 0 c, co-operating therewith, substantially as described.

In'testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CHARLES C. PECK.

Witnesses WILLIs G. Sco'rr, CHARLES E. PINNEY. 

